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      <a href="../../index.html">all files</a> / <a href="index.html">src/scroll/</a> mouse-wheel.js
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<span class="cline-any cline-neutral">&nbsp;</span></td><td class="text"><pre class="prettyprint lang-js">import { addEvent, removeEvent } from '../util/dom'
import { ease } from '../util/ease'
&nbsp;
export function mouseWheelMixin(BScroll) {
  BScroll.prototype._initMouseWheel = function () <span class="fstat-no" title="function not covered" >{</span>
<span class="cstat-no" title="statement not covered" >    this._handleMouseWheelEvent(addEvent)</span>
&nbsp;
<span class="cstat-no" title="statement not covered" >    this.on('destroy', () =&gt; <span class="fstat-no" title="function not covered" >{</span></span>
<span class="cstat-no" title="statement not covered" >      clearTimeout(this.mouseWheelTimer)</span>
<span class="cstat-no" title="statement not covered" >      clearTimeout(this.mouseWheelEndTimer)</span>
<span class="cstat-no" title="statement not covered" >      this._handleMouseWheelEvent(removeEvent)</span>
    })
&nbsp;
<span class="cstat-no" title="statement not covered" >    this.firstWheelOpreation = true</span>
  }
&nbsp;
  BScroll.prototype._handleMouseWheelEvent = function (eventOperation) <span class="fstat-no" title="function not covered" >{</span>
<span class="cstat-no" title="statement not covered" >    eventOperation(this.wrapper, 'wheel', this)</span>
<span class="cstat-no" title="statement not covered" >    eventOperation(this.wrapper, 'mousewheel', this)</span>
<span class="cstat-no" title="statement not covered" >    eventOperation(this.wrapper, 'DOMMouseScroll', this)</span>
  }
&nbsp;
  BScroll.prototype._onMouseWheel = function (e) <span class="fstat-no" title="function not covered" >{</span>
<span class="cstat-no" title="statement not covered" >    if (!this.enabled) {</span>
<span class="cstat-no" title="statement not covered" >      return</span>
    }
<span class="cstat-no" title="statement not covered" >    e.preventDefault()</span>
&nbsp;
<span class="cstat-no" title="statement not covered" >    if (this.options.stopPropagation) {</span>
<span class="cstat-no" title="statement not covered" >      e.stopPropagation()</span>
    }
&nbsp;
<span class="cstat-no" title="statement not covered" >    if (this.firstWheelOpreation) {</span>
<span class="cstat-no" title="statement not covered" >      this.trigger('scrollStart')</span>
    }
<span class="cstat-no" title="statement not covered" >    this.firstWheelOpreation = false</span>
&nbsp;
    const {speed = 20, invert = false, easeTime = 300} = <span class="cstat-no" title="statement not covered" >this.options.mouseWheel</span>
&nbsp;
<span class="cstat-no" title="statement not covered" >    clearTimeout(this.mouseWheelTimer)</span>
<span class="cstat-no" title="statement not covered" >    this.mouseWheelTimer = setTimeout(() =&gt; <span class="fstat-no" title="function not covered" >{</span></span>
<span class="cstat-no" title="statement not covered" >      if (!this.options.snap &amp;&amp; !easeTime) {</span>
<span class="cstat-no" title="statement not covered" >        this.trigger('scrollEnd', {</span>
          x: this.x,
          y: this.y
        })
      }
<span class="cstat-no" title="statement not covered" >      this.firstWheelOpreation = true</span>
    }, 400)
&nbsp;
    let wheelDeltaX
    let wheelDeltaY
&nbsp;
<span class="cstat-no" title="statement not covered" >    switch (true) {</span>
      case 'deltaX' in e:
<span class="cstat-no" title="statement not covered" >        if (e.deltaMode === 1) {</span>
<span class="cstat-no" title="statement not covered" >          wheelDeltaX = -e.deltaX * speed</span>
<span class="cstat-no" title="statement not covered" >          wheelDeltaY = -e.deltaY * speed</span>
        } else {
<span class="cstat-no" title="statement not covered" >          wheelDeltaX = -e.deltaX</span>
<span class="cstat-no" title="statement not covered" >          wheelDeltaY = -e.deltaY</span>
        }
<span class="cstat-no" title="statement not covered" >        break</span>
      case 'wheelDeltaX' in e:
<span class="cstat-no" title="statement not covered" >        wheelDeltaX = e.wheelDeltaX / 120 * speed</span>
<span class="cstat-no" title="statement not covered" >        wheelDeltaY = e.wheelDeltaY / 120 * speed</span>
<span class="cstat-no" title="statement not covered" >        break</span>
      case 'wheelDelta' in e:
<span class="cstat-no" title="statement not covered" >        wheelDeltaX = wheelDeltaY = e.wheelDelta / 120 * speed</span>
<span class="cstat-no" title="statement not covered" >        break</span>
      case 'detail' in e:
<span class="cstat-no" title="statement not covered" >        wheelDeltaX = wheelDeltaY = -e.detail / 3 * speed</span>
<span class="cstat-no" title="statement not covered" >        break</span>
      default:
<span class="cstat-no" title="statement not covered" >        return</span>
    }
&nbsp;
    let direction = <span class="cstat-no" title="statement not covered" >invert ? -1 : 1</span>
<span class="cstat-no" title="statement not covered" >    wheelDeltaX *= direction</span>
<span class="cstat-no" title="statement not covered" >    wheelDeltaY *= direction</span>
&nbsp;
<span class="cstat-no" title="statement not covered" >    if (!this.hasVerticalScroll) {</span>
<span class="cstat-no" title="statement not covered" >      wheelDeltaX = wheelDeltaY</span>
<span class="cstat-no" title="statement not covered" >      wheelDeltaY = 0</span>
    }
&nbsp;
    let newX
    let newY
<span class="cstat-no" title="statement not covered" >    if (this.options.snap) {</span>
<span class="cstat-no" title="statement not covered" >      newX = this.currentPage.pageX</span>
<span class="cstat-no" title="statement not covered" >      newY = this.currentPage.pageY</span>
&nbsp;
<span class="cstat-no" title="statement not covered" >      if (wheelDeltaX &gt; 0) {</span>
<span class="cstat-no" title="statement not covered" >        newX--</span>
      } else <span class="cstat-no" title="statement not covered" >if (wheelDeltaX &lt; 0) {</span>
<span class="cstat-no" title="statement not covered" >        newX++</span>
      }
&nbsp;
<span class="cstat-no" title="statement not covered" >      if (wheelDeltaY &gt; 0) {</span>
<span class="cstat-no" title="statement not covered" >        newY--</span>
      } else <span class="cstat-no" title="statement not covered" >if (wheelDeltaY &lt; 0) {</span>
<span class="cstat-no" title="statement not covered" >        newY++</span>
      }
&nbsp;
<span class="cstat-no" title="statement not covered" >      this._goToPage(newX, newY)</span>
<span class="cstat-no" title="statement not covered" >      return</span>
    }
&nbsp;
<span class="cstat-no" title="statement not covered" >    newX = this.x + Math.round(this.hasHorizontalScroll ? wheelDeltaX : 0)</span>
<span class="cstat-no" title="statement not covered" >    newY = this.y + Math.round(this.hasVerticalScroll ? wheelDeltaY : 0)</span>
&nbsp;
<span class="cstat-no" title="statement not covered" >    this.movingDirectionX = this.directionX = wheelDeltaX &gt; 0 ? -1 : wheelDeltaX &lt; 0 ? 1 : 0</span>
<span class="cstat-no" title="statement not covered" >    this.movingDirectionY = this.directionY = wheelDeltaY &gt; 0 ? -1 : wheelDeltaY &lt; 0 ? 1 : 0</span>
&nbsp;
<span class="cstat-no" title="statement not covered" >    if (newX &gt; this.minScrollX) {</span>
<span class="cstat-no" title="statement not covered" >      newX = this.minScrollX</span>
    } else <span class="cstat-no" title="statement not covered" >if (newX &lt; this.maxScrollX) {</span>
<span class="cstat-no" title="statement not covered" >      newX = this.maxScrollX</span>
    }
&nbsp;
<span class="cstat-no" title="statement not covered" >    if (newY &gt; this.minScrollY) {</span>
<span class="cstat-no" title="statement not covered" >      newY = this.minScrollY</span>
    } else <span class="cstat-no" title="statement not covered" >if (newY &lt; this.maxScrollY) {</span>
<span class="cstat-no" title="statement not covered" >      newY = this.maxScrollY</span>
    }
&nbsp;
    const needTriggerEnd = <span class="cstat-no" title="statement not covered" >this.y === newY</span>
<span class="cstat-no" title="statement not covered" >    this.scrollTo(newX, newY, easeTime, ease.swipe)</span>
<span class="cstat-no" title="statement not covered" >    this.trigger('scroll', {</span>
      x: this.x,
      y: this.y
    })
<span class="cstat-no" title="statement not covered" >    clearTimeout(this.mouseWheelEndTimer)</span>
<span class="cstat-no" title="statement not covered" >    if (needTriggerEnd) {</span>
<span class="cstat-no" title="statement not covered" >      this.mouseWheelEndTimer = setTimeout(() =&gt; <span class="fstat-no" title="function not covered" >{</span></span>
<span class="cstat-no" title="statement not covered" >        this.trigger('scrollEnd', {</span>
          x: this.x,
          y: this.y
        })
      }, easeTime)
    }
  }
}
&nbsp;</pre></td></tr>
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